#define _POSIX_C_SOURCE 200809L

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <ctype.h>

#include "zpm.h"

#include "sqlite3.h"

#define DMARK fprintf(stderr, "mark %s %s:%d\n", __FILE__, __func__, __LINE__)

/*
 * flags 0 = find installed
 * flags 1 = skip installed
 * flags 2 = skip not installed
 */

struct zpm_package *zpm_package_alloc(struct zpm *zpm) {
	struct zpm_package *pkg;

	pkg = malloc(sizeof *pkg);
	if (pkg) {
		pkg->zpm = zpm;
		pkg->release = 0;
	}
	return pkg;
}

void zpm_sqlite_error(struct zpm *zpm) {
	zpm->error = 1;
	if (zpm->errmsg) free(zpm->errmsg);
	zpm->errmsg = strdup((const char *)sqlite3_errmsg(zpm->db));
}

char *zpm_findpkg(struct zpm *zpm, char *pkgstr, char *where) {
	char *select = "select pkgid, package, version, release from packages_pkgid";
	char *group = "group by package having max( version||'-'||release collate vercmp) order by length(package), package, version||'-'||release collate vercmp";

//	char *order = "order by package, version collate vercmp, cast(release as integer)";
	sqlite3_str *sql;
	char *query, *pkgid = 0;

	/* null pkgstr find "best" package
	 * best is shortest complete package if any are complete
	 * shortest incomplete if any are incomplete
	 * where more than one version is in those sets, best is
	 * latest as determined by vercmp
	 */

	sql = sqlite3_str_new(zpm->db);

	sqlite3_str_appendall(sql, select);
	sqlite3_str_appendall(sql, " where true");

	if (pkgstr) {
		int release;
		char version[32];
		char package[32];

		zpm_parse_package(pkgstr, package, version, &release);
		if (*package != 0) {
			sqlite3_str_appendf(sql, " and package = %Q",
					package);
		}
		if (*version != 0) {
			sqlite3_str_appendf(sql, " and version = %Q",
					version);
		}
		if (release != 0) {
			sqlite3_str_appendf(sql, " and release = %d",
					release);
		}
	}

	if (where) {
		sqlite3_str_appendall(sql, " and ");
		sqlite3_str_appendall(sql, where);
	}


	sqlite3_str_appendall(sql, " ");
	sqlite3_str_appendall(sql, group);
	sqlite3_str_appendall(sql, " limit 1;");

	if (sqlite3_str_errcode(sql)) {
		zpm->error = 1;
		sqlite3_free(sqlite3_str_finish(sql));
		return 0;
	}

	query = sqlite3_str_finish(sql);

	pkgid = zpm_db_string(zpm, query);;

	sqlite3_free(query);

	return pkgid;
}